desktop.php in eyeOS 0.8.9 and earlier tests for the existence of the _SESSION variable before calling the session_start function, which allows remote attackers to execute arbitrary PHP code and possibly conduct other attacks by modifying critical assumed-immutable variables, as demonstrated using PHP code in the _SESSION[apps][eyeOptions.eyeapp][wrapup] variable.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24569
http://www.vupen.com/english/advisories/2006/0466
http://www.securityfocus.com/bid/16537
http://www.securityfocus.com/archive/1/424329/100/0/threaded
http://www.gulftech.org/?node=research&article_id=00096-02072006
http://securitytracker.com/id?1015609